SymCom’s ISS-102A-LC (Latching Controller) pump controller with latching/differential logic. Each input channel is “active” when the corresponding switch is closed (or low resistance is detected, if using probes). When the LAG input (CH2) is activated, the output contact closes. Following latching/differential logic, the output contact remains closed until both the LEAD (CH1) and LAG (CH2) inputs are deactivated. The green RUN LED illuminates when the output relay is energized.